Badou Jack vs George Groves: what time does it start and where can I watch it?

George Groves has his third crack at a world title in the early hours of Sunday morning, when he challenges Badou Jack for his WBC super-middleweight title on the undercard of Floyd Mayweather's bout against Andre Berto at the MGM Grand Garden Arena in Las Vegas.

The ring walk for the Groves fight is expected between 1am and 2am, depending on how long the fights before last.

Groves was beaten by Carl Froch in both of his previous two world title contests - the first by a controversial stoppage in November 2013, the second by a conclusive knockout in front of 80,000 fans at Wembley Stadium.

Since then, Groves has won two fights - against Christopher Rebrasse and Denis Douglin - putting himself back in wold title contention.

"I'm really excited. I'm ready to fight and have been for a long time," the 27-year-old said.

Career in pictures: Floyd Mayweather

Career in pictures: Floyd Mayweather

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Floyd Mayweather

Floyd Mayweather triumphs in his rematch against Maidana last month by a unanimous decision, making easier work of his opponent than in their first bout

REUTERS/Steve Marcus

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Floyd Mayweather

Floyd Mayweather and Marcos Maidana square off during their press conference to promote their rematch for September 2014

GETTY IMAGES

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Floyd Mayweather

Floyd Mayweather hands previously unbeaten Saul Alvarez a boxing lesson and leaves him slumped and desolate in his corner in September 2013

Getty Images; AP

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Floyd Mayweather

Floyd Mayweather throws a jab to the face of Robert Guerrero during his comfortable win in May 2013

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Floyd Mayweather

Floyd Mayweather is forced against the ropes in his last fight, against Miguel Cotto but prevailed by a unanimous decision in 2012

AFP/Getty Images

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Floyd Mayweather

Floyd Mayweather knocks out Victor Ortiz in the fourth round of their 2011 bout at the MGM Grand, Las Vegas

AP

"We've been out in the States for five or six weeks and I knew this period would feel like it was dragging. I'm counting down the seconds until September 12.

"Every fight, you feel pressure. There's the same pressure as the last if not more, because every one feels more important. After losing my last world title challenge, there was a lot of pressure there."